Question

此查询有效：

SELECT
TOP 100     SUBSTRING(column_name FROM 6 FOR CHARACTER_LENGTH(column_name) - 5) AS X
FROM        db_name.table_name

但是以下查询（添加了WHERE子句）不会执行。

SELECT
TOP 100     SUBSTRING(column_name FROM 6 FOR CHARACTER_LENGTH(column_name) - 5) AS X
FROM        db_name.table_name
WHERE       NOT EXISTS
            (
            SELECT    1
            FROM      db_name2.lookup_name H
            WHERE     H.SRC_NUM1 = X 
                      AND H.SRC_TYPE = 11
            )

上面的查询抛出

SELECT失败。 2663：SUBSTR：字符串下标超出table_name.column_name
中的范围

但是，以下一个有效（原始SELECT是嵌套的）

SELECT      *
FROM        (
            SELECT
            TOP 100   SUBSTRING(column_name FROM 6 FOR CHARACTER_LENGTH(column_name) - 5) AS X
            FROM      db_name.table_name
            ) A
WHERE       NOT EXISTS
            (
            SELECT    1
            FROM      db_name2.lookup_name H
            WHERE     H.SRC_NUM1 = X 
                      AND H.SRC_TYPE = 11
            )

为什么会这样？我正在使用SQL助手来执行查询，但我怀疑它是否相关。

Answer 1

尝试更改（当column_name的长度小于6时可能会导致错误）：

single  1
single  1
single  1
single  0
five    1
five    4
five    5
five    4
five    1
five    0

Teradata SUBSTRING指数超出界限

1 个答案: